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--- 184_notes:loop [2018/11/01 21:28] – dmcpadden
+++ 184_notes:loop [2022/04/04 12:40] – hallstein
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 Section 21.6 in Matter and Interactions (4th edition)
-[[184_notes:i_thru|Next Page: Current through a Loop]]
+/*[[184_notes:i_thru|Next Page: Current through a Loop]]
-[[184_notes:motiv_amp_law|Previous page: Motivating Ampere's Law]]
+[[184_notes:motiv_amp_law|Previous page: Motivating Ampere's Law]]*/
 ===== Magnetic field along a closed loop =====
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 As you have seen before, the [[184_notes:moving_q|magnetic field circulates around a moving charge]]. Below is a simulation that shows this for a series of moving point charges.
-{{url>http://web.pa.msu.edu/people/caballero/teaching/simulations/MagneticFieldCirculation.html 675px,425px|Charges moving along a line}}
+{{url>https://web.pa.msu.edu/people/caballero/teaching/simulations/MagneticFieldCirculation.html 675px,425px|Charges moving along a line}}
 As you can see, the sizes of the magnetic field vectors (the arrows) get larger as the charges get closer to the observation locations and get smaller as they pass and move away. The direction of the magnetic field is always around the path of the charges. Now, imagine a constant stream of particles very close together, that is, a current of many electrons moving in a wire. In that case, the direction of the magnetic field is still around the wire, but the magnitude stays constant. That is, **for a steady current, the magnetic field at any one point is a constant in time**. Furthermore, **for cylindrical wires (the ones we will focus on), the magnitude of magnetic field is constant for a given distance from the wire**. You saw this with the long wire when we solved the problem using Biot-Savart.